Key result
Diet and exercise training combined, compared to diet alone, significantly improved heart rate recovery at 1 minute (37.3 ± 2.6; P=0.01) and cardiac autonomic nervous system activity (P=0.001).
Why the study?
Does diet and exercise training combined improve heart rate recovery and cardiac autonomic nervous system activity in obese children compared to diet alone?
Does diet and exercise training combined improve heart rate recovery and cardiac autonomic nervous system activity in obese children compared to diet alone?
Combining exercise training with a hypocaloric diet improves heart rate recovery and cardiac autonomic activity in obese children, whereas diet alone does not.
May support adding exercise to diet for autonomic recovery in obese children; hypothesis-generating, needs RCTs before practice change.
The purpose of this study was to test the hypotheses that in obese children: 1) hypocaloric diet (D) improves both heart rate recovery at 1 min (Δ HRR1) cfter an exercise test, and cardiac autonomic nervous system activity (CANSA) in obese children; 2) Diet and exercise training (DET) combined leads to greater improvement in both Δ HRR1 after an exercise test and in CANSA, than D alone. Moreover, we examined the relationships among Δ HRR1, CANSA, cardiorespiratory fitness and anthropometric variables (AV) in obese children submitted to D and to DET. 33 obese children (10 ± 0.2 years; body mass index (BMI) >95 (th) percentile) were divided into 2 groups: D (n=15; BMI=31 ± 1 kg/m²)) and DET (n=18; 29 ± 1 kg/m²). All children performed a maximal cardiopulmonary exercise test on a treadmill. The Δ HRR1 or LF/HF ratio (P>0.05). In contrast, the DET group showed increased peak VO₂ ( P=0.01) and improved Δ HRR1 (Δ HRR1=37.3 ± 2.6; P=0.01) and LF/HF ratio ( P=0.001). The DET group demonstrated significant relationships among Δ HRR1, peak VO₂ and CANSA (P<0.05). In conclusion, DET, in contrast to D, promoted improved ÄΔ HRR1 and CANSA in obese children, suggesting a positive influence of increased levels of cardiorespiratory fitness by exercise training on cardiac autonomic activity.
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Prado et al. (2010) studied Obese children (n=33). Diet and exercise training (DET) vs. Hypocaloric diet alone (D) was evaluated on Heart rate recovery at 1 min (Δ HRR1) (p=0.01). Diet and exercise training combined, compared to diet alone, significantly improved heart rate recovery at 1 minute (37.3 ± 2.6; P=0.01) and cardiac autonomic nervous system activity (P=0.001).
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